Oscillator



FIG. 1 is a top, left and front perspective view of the oscillator embodying our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a sectional view thereof taken along the lines 8—8 of FIG. 7. 

The ornamental design for an oscillator, as shown and described. 